KTR BoWex-ELASTIC HEW1 Manual

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
1 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
BoWex-ELASTIC®
highly flexible flange couplings types
HEW1, HEW2 and their combinations
according to standard 94/9/EC (ATEX 95)
for finish bored, pilot bored and unbored couplings
Type HEW1 Type HEW2
BoWex-ELASTIC®
highly flexible flange couplings types
HEW-ZS and their combinations
for finish bored, pilot bored and unbored couplings
Type HEW-ZS

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
2 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
The BoWex-ELASTIC®HEW is a high flexible plug-in shaft coupling. It dampens torsional
oscillations, decreases shocks and is impact sound insulating.
The BoWex-ELASTIC®HEW coupling compensates for relatively considerable shaft
displacements caused by e. g. inaccuracies in production, heat expansion etc.
Table of Contents
1 Technical Data
2 Hints
2.1 Coupling Selection
2.2 General Hints
2.3 Safety and Advice Hints
2.4 General Hints to Danger
2.5 Proper Use
3 Storage
4 Assembly
4.1 Components of the Couplings
4.2 Hint Regarding the Finish Bore
4.3 Assembly of the Coupling
4.4 Displacements - Alignment of the Couplings
4.5 Spares Inventory, Customer Service Addresses
5 Enclosure A
Hints and instructions regarding the use in hazardous areas
5.1 Use in Hazardous Areas According to the Regulations
5.2 Control intervals for couplings in hazardous areas
5.3 Checking of torsional backlash
5.4 Approximate values of wear
5.5 Marking of coupling for the hazardous area
5.6 Starting
5.7 Breakdowns, causes and elimination
5.8 Certificate of Conformity according to the EG Standards 94/9/EG
dated 23 March 1994

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
3 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
1 Technical Data
Illustration 1: BoWex-ELASTIC®type HEW1 Illustration 2: BoWex-ELASTIC®type HEW2
Table 1: dimensions – type HEW1 and HEW2
Max. finish bore
[mm] Dimensions [mm]
Size d2d
3D D2z x M D4D 5D 6l 1l 2
42 48 50 68 162 6 M6 146 180 85 50 45
48 48 55 68 180 8 M6 164 200 92 50 45
65 65 75 96 224 8 M8 205 245 125 70 55
80 80 80 124 295,27 8 M10 266 318 130 90 70
G 80 85 95 124 333,4 8 M10 302 358 145 90 80
100 100 110 152 438,15 8 M12 350 478 158 110 80
125 125 125 192 438,15 16 M12 416 478 175 140 99
G 125 125 125 192 489 8 M12 440 530 175 140 95
150 150 150 225 542,9 6 M16 470 585 225 150 140
Dimensions
[mm] Mass moment of inertia [kgm2]
Size l3l
4l 5E E1L HEW1 L HEW2
Weight with
max. bore
[kg] JAJ
L
42 15 50 42 4 32 132 104 4,3 0,0121 0,0015
48 17 55 45 4 32 137 109 5,5 0,0204 0,0019
65 28 75 63 5 42 187 150 13,2 0,0752 0,0071
80 17 80 70 5 45 215 160 19,7 0,1449 0,0285
G 80 22 90 78 5 55 235 185 25,9 0,2748 0,0422
100 16 111,5 110 - 57 278,5 - 50,5 0,8396 0,1068
125 18 170 171 - 47 357 - 75,8 0,9631 0,2777
G 125 15 170 157 - 47 357 - 96,1 1,4491 0,3031
150 18 150 143 20 64 364 320 114,3 2,8644 0,4314
Table 2: torques
Torque [Nm] Torque [Nm]
Size Elastomer hardness
[Shore A] TKN T
K max. Size Elastomer hardness
[Shore A] TKN T
K max.
40 130 390 40 2000 6000
50 150 450 50 2500 7500
42 65 180 540 100 65 3200 9600
40 200 600 40 3000 9000
50 230 690 50 4000 12000
48 65 280 840 125 70 5000 15000
40 350 1050 40 4000 12000
50 400 1200 50 5200 16000
65 65 500 1500 G 125 70 6500 20000
40 750 2250 40 5500 16500
50 950 2850 50 7000 21000
80 65 1200 3600 150 70 9000 27000
40 1250 3750
50 1600 4800
G 80 65 2000 6000

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
4 of 20
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Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
1 Technical Data
Illustration 3: BoWex-ELASTIC®type HEW-ZS (size 48 to G 80) Illustration 4: BoWex-ELASTIC®type HEW-ZS (size 100 to G 125)
Table 3: dimensions – type HEW-ZS1)
Max. finish
bore [mm] Dimensions [mm]
Size d3d
4D 2z x M D4D 5D 6D 7D 8l 1l 2l 3
48 55 28 180 8 M6 164 200 92 78 45 50 45 17
65 75 45 224 8 M8 205 245 125 110 72 55 55 28
80 80 65 295,27 8 M10 266 318 130 145 100 90 70 17
G 80 95 65 333,4 8 M10 302 358 145 145 100 90 80 22
100 110 90 438,15 8 M12 350 478 158 180 135 80 80 16
125 125 120 438,15 16 M12 416 478 175 225 180 80 99 18
G 125 125 120 489 8 M12 440 530 175 225 180 80 95 15
Dimensions
[mm] Removeable part HEW-ZS LZ[mm] Mass moment of
inertia [kgm2]
Size l4l
5l 6100 120 140 180 250
Weight
with max.
bore [kg] JAJ
L
48 55 45 45 6,9 0,0203 0,0050
65 75 63 56 16,0 0,0747 0,0160
80 80 70 75 25,5 0,1447 0,0699
G 80 90 78 75 34,2 0,2752 0,1412
100 111,5 110 76 
125 170 171 76 
G 125 170 157 76 
1) For torques of BoWex-ELASTIC®type HEW-ZS see table 2.
BoWex-ELASTIC®couplings with attached parts that can generate heat, sparks and static
charging (e. g. combinations with brake drums, brake disks, overload systems like torque
limiters, impellers etc.) are not allowed for the use in hazardous areas.
A separate checking must be made.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
5 of 20
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Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
2 Hints
2.1 Coupling Selection
!
CAUTION!
For a continuous and troublefree operation of the coupling it must be designed according to
the selection instructions (according to DIN 740 part 2) for the particular application
(see BoWex-ELASTIC®catalogue).
If the operating conditions (performance, speed, changes on engine and machine) change,
the coupling selection must be checked again.
Please make sure that the technical data regarding torque only refer to the elastomer part.
The transmissible torque of the shaft/hub connection must be checked by the orderer, and he
is responsible for the same.
For drives with dangerous torsional vibration (drives with periodical load on torsional vibration) it is necessary to
make a torsional vibration calculation to ensure a perfect selection. Typical drives with dangerous torsional
vibration are e. g. drives with diesel engines, piston pumps, piston compressors etc. On request KTR will perform
the coupling selection and the torsional vibration calculation.
2.2 General Hints
Please read through these mounting instructions carefully before you set the coupling into operation.
Please pay special attention to the safety instructions!
The BoWex-ELASTIC®coupling is suitable and approved for the use in hazardous areas. When
using the coupling in hazardous areas please observe the special hints and instructions regarding
safety mentioned in enclosure A.
The mounting instructions are part of your product. Please keep them carefully and close to the coupling.
The copyright for these mounting instructions remains with KTR Kupplungstechnik GmbH.
2.3 Safety and Advice Hints
STOP DANGER! Dangerofinjurytopersons.
! CAUTION! Damagesonthemachinepossible.
A TTE NT IO N! Pointing to important items.
PRECAUTION! Hintsconcerningexplosionprotection.
2.4 General Hints of Danger
STOP
DANGER!
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is protected against unintentional engagement. You can be seriously hurt
by rotating parts. Please make absolutely sure to read through and observe the following
safety instructions.
All operations on and with the coupling have to be performed taking into account "safety first".
Please make sure to disengage the power pack before you perform your work.
Protect the power pack against unintentional engagement, e. g. by providing hints at the place of engagement
or removing the fuse for current supply.
Do not touch the operation area of the coupling as long as it is in operation.
Please protect the coupling against unintentional touch. Please provide for the necessary protection devices
and caps.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
6 of 20
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Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
2 Hints
2.5 Proper Use
You may only assemble, operate and maintain the coupling if you
carefully read through the mounting instructions and understood them
had technical training
are authorized to do so by your company
The coupling may only be used in accordance with the technical data (see table 1 to 3 in chapter 1).
Unauthorized modifications on the coupling design are not admissible. We do not take any warranty for resulting
damages. To further develop the product we reserve the right for technical modifications.
The BoWex-ELASTIC®type HEW and HEW-ZS described in here corresponds to the technical status at the
time of printing of these mounting instructions.
3 Storage
The coupling hubs are supplied in preserved condition and can be stored at a dry and roofed place for 6 - 9
months.
The features of the elastomer parts remain unchanged for up to 5 years in case of favourable storage conditions.
!
CAUTION!
The storage rooms may not include any ozone-generating devices, like e. g. fluorescent
light sources, mercury-vapour lamps or electrical high-voltage appliances.
Humid storage rooms are not suitable.
Please make sure that there is no condensation. The best relative air humidity is below 65%.
4 Assembly
Basically the coupling is supplied in individual parts. Before assembly the coupling has to be inspected for
completeness.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
7 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.1 Components of the Couplings
Components of BoWex-ELASTIC®, type HEW1 and HEW2
Component Quantity Designation
1 1 elastomer part
2 1 hub
4 1 coupling flange
5 see table 1 1) cylinder head screw DIN EN ISO 4762 1)
7 2 setscrew DIN EN ISO 4029
1) For size 150 nuts according to DIN EN ISO 4014 are required additionally.
Illustration 5: BoWex-ELASTIC®type HEW1 Illustration 6: BoWex-ELASTIC®type HEW2
Components of BoWex-ELASTIC®, type HEW-ZS
Component Quantity Designation
1 1 elastomer part
2 1 hub spec.
3 1 ZW-hub
4 1 coupling flange
4.1 1 adaptor flange
4.2 1 flange hub
4.3 see table 4 cylinder head screw DIN EN ISO 4762
5 see table 1 cylinder head screw DIN EN ISO 4762
6 see table 4 cylinder head screw DIN EN ISO 4762
7 2 setscrew DIN EN ISO 4029
Illustration 7: BoWex-ELASTIC®type HEW-ZS (size 48 to G 80) Illustration 8: BoWex-ELASTIC®type HEW-ZS (size 100 to G 125)
Table 4: cylinder head screws DIN EN ISO 4762
Size 48 65 80 G 80 100 125 G 125
Quantity z (component 4.3) - - - - 15 12 12
Quantity z (component 6) 8 12 12 12 12 12 12

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
8 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.2 Hint Regarding the Finish Bore
STOP
DANGER!
The maximum permissible bore diameters d (see table 1
to 3 in chapter 1 - Technical Data) must not be exceeded.
If these figures are disregarded, the coupling may tear.
Rotating particles may cause serious danger.
Hub bores or coupling flange bores machined by the customer
have to observe concentric running or axial running,
respectively (see illustration 9).
Please make absolutely sure to observe the figures for dmax.
Carefully align the hubs or coupling flange when the finish
bores are brought in.
Please use a setscrew according to DIN EN ISO 4029 or an
end plate to fasten the hubs or coupling flange axially.
Illustration 9: concentric running
and axial running
!
CAUTION!
The orderer is responsible for all subsequently made machinings to unbored or pilot bored
and to finish machined coupling parts and spare parts. KTR does not assume any warranty
claims resulting from insufficient remachining.
PRECAUTION!
KTR supplies unbored or pilot bored coupling parts and spare parts on explicit customer´s
request. These parts are additionally labelled with the symbol .
Table 5: setscrews DIN EN ISO 4029
Size 42 48 65 80 G 80 100 125 G 125 150
Screw size M8 M8 M10 M10 M10 M12 M16 M16 M20
Tightening torque
TA[Nm] 10 10 17 17 17 40 80 80 140
Table 6: Recommended combinations of fit acc. to DIN 748/1
Bore [mm]
above to Shaft tolerance Bore tolerance
50 k6
50 m6 H7
(KTR-Standard)
If a feather key is intended to be used in the hub, it should correspond to the tolerance ISO JS9 (KTR-Standard)
with normal operating conditions or ISO P9 with heavy operating conditions (frequently alternating torsional
direction, shock loads, etc.).
The transmissible torque of the shaft/hub connection must be checked by the orderer, and he is responsible for
the same.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
9 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.3 Assembly of the Coupling
ATTENTION!
We recommend to check bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Heating the hub, flange hub or coupling flange slightly (approx. 80 °C) allows for an easier installation onto the
shaft.
PRECAUTION!
Please pay attention to the danger of ignition in hazardous areas.
STOP
DANGER!
Touching the heated hubs causes burns.
We would recommend to wear safety gloves.
!
CAUTION!
For the assembly please make sure that the distance dimension E or LZ(see table 1 and 3) is
kept to ensure that the elastomer part can be moved axially.
Disregarding this hint may cause damage on the coupling.
Applying for type HEW-ZS only (size 100 to G 125)!
Screw the flange hub (component 4.2) to the additional flange (component 4.1) at the tightening torques TA
mentioned in table 7.
Table 7: cylinder head screws DIN EN ISO 4762
Size 100 125 G 125
Tightening torque TA[Nm] 355 355 355
Assemble the hub, flange hub or adaptor flange onto the shaft of driving and driven side.
Shift the power packs in axial direction until the installation dimension LHEW1, LHEW2 or LHEW-ZS has been
achieved.
If the power packs have already been firmly mounted, the mounting dimension has to be adjusted by shifting
the hub, flange hub or coupling flange axially on the shafts.
Fasten the hub, flange hub or coupling flange by tightening the setscrews DIN EN ISO 4029 with cup point
(tightening torque see table 5).
Applying for type HEW-ZS only!
Put the hub spec. (component 2) in front of the hub ZW (component 3) and screw the components at the
tightening torques TAmentioned in table 8.
Table 8: cylinder head screws DIN EN ISO 4762
Size 48 65 80 G 80 100 125 G 125
Tightening torque
TA[Nm] 41 69 120 120 190 295 295

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
10 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.3 Assembly of the Coupling
Put the elastomer part (component 1) in front of the flange hub with additional flange or coupling flange.
Screw the parts hand-tight for the time being. Afterwards tighten the screws at the tightening torque TA
mentioned in table 9.
!
CAUTION!
For the assembly please make sure that the hub toothing is covered completely by the
internal toothing of the elastomer part. (Please observe the assembly dimensions LHEW1,
LHEW2 or LHEW-ZS.)
Disregarding this hint may cause damage on the coupling.
Table 9: cylinder head screws DIN EN ISO 4762
Size 42 48 65 80 G 80 100 125 G 125 150
Tightening torque
TA[Nm] 14 14 35 69 69 120 120 120 295
PRECAUTION!
If used in hazardous areas the grub screws to fix the hub as well as all screw connections
must be additionally secured against self-loosening, e. g. glue with Loctite (medium
strength).
!
CAUTION!
Please observe the manufacturer´s instructions when using the glue.
Do not put any glue onto the rubber surfaces.
4.4 Displacements - Alignment of the Couplings
The BoWex-ELASTIC®HEW couplings accept a deviation of position of the machine parts to be connected up to
the data indicated in table 10.
In case of the alignment, the radial and angular displacement should be as small as possible, because the
lifetime is increased hereby under the same operating conditions.
The alignment of the BoWex-ELASTIC®HEW coupling has to be effected from the shaft-sided coupling hub to
one of the processed surfaces of the flange hub.
!
CAUTION!
In order to ensure a long service life of the coupling and to avoid dangers regarding the use
in hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 10). If the figures
are exceeded, the coupling is damaged.
The more accurate the alignment of the coupling, the higher is its lifetime.
In case of a use in hazardous areas for the explosion group IIC (marking II 2GD c IIC T X),
only half of the displacement figures (see table 10) are permissible.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
11 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.4 Displacements - Alignment of the Couplings
Please note:
The displacement figures mentioned in table 10 are maximum figures which must not arise in parallel. If radial
and angular displacement arises in parallel, the permissible displacement figures may only be used
proportionately (see illustration 11).
The displacement figures mentioned are general figures that apply up to an ambient temperature of 80 °C,
ensuring a sufficient service life of the BoWex-ELASTIC®coupling.
Displacement figures between the speeds indicated have to be interpolated accordingly. If necessary, please
ask about the displacement for the corresponding coupling type.
Please check with a dial gauge, ruler or feeler whether the permissible displacement figures of table 10 can be
observed.
Radial displacement Angular displacement Axial displacement
Illustration 10: displacements
Example for the misalignment
combinations given in illustration 11:
Example 1:
Kr= 30 %
Kw= 70 %
Example 2:
Kr= 60 %
Kw= 40 %
Ktotal = Kr+ Kw100 %
Illustration 11:
combinations of
displacement

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
12 of 20
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Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
4 Assembly
4.4 Displacements - Alignment of the Couplings
Table 10: displacement figures
Size
Displacement figures Elastomer hardness
[Shore A] 42 48 65 80 G 80 100
40 1,1 1,2 1,6 1,8 2,0 2,2
50 1,0 1,1 1,5 1,7 1,9 2,0
perm. radial displacement
with n=1500 1/min.
Kr(mm) 65 0,5 0,5 0,7 0,8 0,9 1,0
40 0,8 1,1 1,4 1,6 1,8 1,9
50 0,7 1,0 1,3 1,5 1,7 1,7
perm. radial displacement
with n=3000 1/min.
Kr(mm) 65 0,4 0,4 0,5 0,6 0,8 0,9
40 3,6 3,8 5,1 5,7 6,0 6,5
50 3,3 3,5 4,7 5,3 5,7 6,0
max. radial displacement
Kr max. (mm) 1) 65 1,5 1,7 2,2 2,4 2,7 3,0
40 1,0 1,0 1,0 1,0 1,0 1,0
50 0,75 0,75 0,75 0,75 0,75 0,75
perm. angular displacement
with n=1500 1/min.
Kw(°) 65 0,5 0,5 0,5 0,5 0,5 0,5
40 0,5 0,5 0,5 0,5 0,5 0,5
50 0,4 0,4 0,4 0,4 0,4 0,4
perm. angular displacement
with n=3000 1/min.
Kw(°) 65 0,25 0,25 0,25 0,25 0,25 0,25
max. angular displacement
Kw max. (°) 1) 40 / 50 / 65 1,5 1,5 1,5 1,5 1,5 1,5
perm. axial displacement
Ka(mm) 40 / 50 / 65 ±2 ±2 ±2 ±2 ±2 ±3
Size
Displacement figures Elastomer hardness
[Shore A] 125 G125 150
40 3,3 3,3 3,5
50 2,5 2,5 2,5
perm. radial displacement
with n=1500 1/min.
Kr(mm) 70 1,1 1,1 1,3
40 2,9 2,9 3,0
50 2,1 2,1 2,2
perm. radial displacement
with n=3000 1/min.
Kr(mm) 70 1,0 1,0 1,1
40 7,5 7,5 8,0
50 6,9 6,9 7,5
max. radial displacement
Kr max. (mm) 1) 70 3,3 3,3 4,0
40 1,0 1,0 1,0
50 0,75 0,75 0,75
perm. angular displacement
with n=1500 1/min.
Kw(°) 70 0,5 0,5 0,5
40 0,5 0,5 0,5
50 0,4 0,4 0,4
perm. angular displacement
with n=3000 1/min.
Kw(°) 70 0,25 0,25 0,25
max. angular displacement
Kw max. (°) 1) 40 / 50 / 70 1,5 1,5 1,5
perm. axial displacement
Ka(mm) 40 / 50 / 70 ±3 ±3 ±5
1) for short-term start
4.5 Spares Inventory, Customer Service Addresses
A basic requirement to guarantee the operational readiness of the coupling is a stock of the most important spare
parts on site.
Contact addresses of the KTR partners for spare parts and orders can be obtained from the KTR homepage at
www.ktr.com.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
13 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
Type HEW1and HEW2: Hub / Elastomer part / Coupling flange
Attachment A only applies for BoWex-ELASTIC HEW1 and HEW2.
5.1 Use in Hazardous Areas According to the Regulations
Conditions of operation in hazardous locations
BoWex-ELASTIC®couplings are suitable for the use according to EC standard 94/9/EC.
1. Industry (with the exception of mining)
device class II of category 2 and 3 (coupling is not approved for device class 1)
media class G (gases, fogs, steams), zone 1 and 2 (coupling is not approved for zone 0)
media class D (dusts), zone 21 and 22 (coupling is not approved for zone 20)
explosion class IIC (explosion class IIA and IIB are included in IIC)
Temperature class:
Temperature class Ambient or operating temperature Max. surface temperature 1)
T4, T3, T2, T1 - 30 °C to + 80 °C 115 °C 2)
T5 - 30 °C to + 65 °C 100 °C
T6 - 30 °C to + 50 °C 85 °C
Explanation:
The maximum surface temperatures each result from the permissible ambient or operating temperature Taplus the maximum
temperature increase T of 35 K which has to be taken into account.
1) The ambient or operating temperature Tais limited to + 80° C by the permissible permanent operating temperature of the
BoWex-ELASTIC®elastomer parts used.
2) The maximum surface temperature of 115 °C applies for the use in locations which are potentially subject to dust
explosion, too.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
14 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.2 Control Intervals for Couplings in Hazardous Areas
Explosion group Control intervals
3G
3D
For couplings which are classified in category 3G or 3D the operating and assembly
instructions that are usual for standard operation apply. During the standard operation
which has to be subject to the analysis of danger of ignition the couplings are free from any
ignition source. Merely the temperature increase produced by proper heating and
depending on the coupling type has to be considered:
for BoWex-ELASTIC®: T = 35 K
II 2GD c IIB
T4, T5, T6
A review of the circumferential backlash and a visual inspection of the flexible elastomer
part must be effected after 1,000 operating hours for the first time, after 6 months at the
latest. Except for centered, stiff connecting flanges (e. g. bellhousings).
If you note unconsiderable or no wear on the elastomer part after this first inspection, the
future inspections can be effected, in case of the same operating parameters, respectively
after 2,000 operating hours or after 18 months at the latest.
If you note considerable wear during the first inspection, so that a change of the elastomer
part would be recommended, please find out the cause according to the table
„Breakdowns“, as far as possible.
The maintenance intervals must be adjusted according to the changed operating
parameters.
BoWex-ELASTIC®
Illustration 12: BoWex-ELASTIC®(type HEW1)
Here the backlash between the hub and
the nylon toothing must be checked by a
torsional backlash, separately from the
drive and the driven end.
The friction / wear may only be Xmax. of the
original toothing strength before the
elastomer part must be replaced.
When reaching the torsional backlash
Smax. the elastomer part must be replaced
immediately, irrespective of the inspection
intervals.
Visual inspection of the elastomer part
(fractures, holes or similar).

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
15 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.3 Checking of Torsional Backlash
!
CAUTION!
To check the torsional backlash the driving power pack turned off must be secured against
unintended switching on.
Drive end
Turn the hub in opposite direction to the direction of drive.
!
CAUTION!
Here the elastomer part may not be axially displaced from its wear position.
Mark elastomer part and hub (see illustration 13).
Turn the hub in the direction of drive and measure the torsional backlash Smax.
When reaching the torsional backlash Smax the elastomer part must be replaced.
Driven end
Turn the hub in the direction of drive.
!
CAUTION!
Here the elastomer part may not be axially displaced from its wear position.
Mark elastomer part and hub (see illustration 13).
Turn the hub in opposite direction to the direction of drive and measure the torsional backlash Smax.
When reaching the torsional backlash Smax the elastomer part must be replaced.
Illustration 13: marking of the elastomer part and the hub

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
16 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.4 Approximate Values of Wear
If the torsional backlash is Smax. [mm] / friction Xmax. [mm], the elastomer part must be replaced.
Reaching the exchange values depends on the operating conditions and the existing operating parameters.
!
CAUTION!
In order to ensure a long lifetime of the coupling and to avoid dangers regarding the use in
hazardous areas, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures indicated (see table 10). If the figures are
exceeded, the coupling is damaged.
Illustration 14: elastomer part in new condition Illustration 15: wear of elastomer part
Table 11:
Limits of wear each hub Limits of wear each hub
Size Friction
Xmax. [mm] Torsional backlash
Smax. [mm] Size Friction
Xmax. [mm] Torsional backlash
Smax. [mm]
42 1,0 1,7 100 1,8 3,1
48 1,0 1,8 125 2,0 3,5
65 1,4 2,5 G 125 2,0 3,5
80 1,6 2,7 150 2,0 3,5
G 80 1,6 2,7
5.5 Marking of Coupling for the Hazardous Area
The ATEX marking of the BoWex-ELASTIC®coupling is performed on the polyamide flange of the elastomer
indicating the following details:
Short labelling:
(standard) II 2GD c IIB T X
Complete labelling: II 2G c IIB T6, T5 bzw. T4
- 30 °C Ta+ 50°C, + 65 °C bzw. + 80 °C
II 2D c T 115 °C - 30 °C Ta+ 80 °C
The labelling with Explosion Group llB included the Explosion Group llA.
!
CAUTION!
The orderer is responsible for all subsequently made machinings to unbored or pilot bored
and to finish machined coupling parts and spare parts. KTR does not assume any warranty
claims resulting from insufficient remachining.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
17 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.6 Starting
Before putting the coupling into operation, check the tightness of the setscrews in the hubs, the alignment and the
distance dimensions LHEW1, LHEW2 bzw. LHEW-ZS and correct, if necessary, and also check all screw connections
regarding the stipulated tightening torques dependent on the type of coupling.
If used in hazardous areas the grub screws to fix the hub as well as all screw connections must be
additionally secured against self-loosening, e. g. glue with Loctite (medium strength).
Last but not least, the coupling protection against unintended contact must be fixed.
The cover must be electrically conductive and be included in the equipotential bonding. Bellhousings (magnesium
part below 7,5 %) made from aluminium and damping rings (NBR) can be used as connecting element between
pump and electric motor. The cover may only be taken off after having stopped the unit.
During operation, please pay attention to
strange running noises
occurring vibrations.
If the couplings are used in dust explosive areas and in mining the operator must make sure that there is no
accumulation of dust in a critical quantity between the cover and the coupling. The coupling must not operate in
an accumulation of dust.
For covers with unlocked openings on the upper side no light metals may be used if the couplings are used as
appliances of appliance group ll (if possible, from stainless steel).
If the couplings are used in mining (appliance group l M2), the cover must not be made from light metal. In
addition, it must be resistant to higher mechanical loads than if it is used as appliance of appliance group ll.
The minimum distance „Sr“ between the protection device and the rotating parts must at least correspond to the
figures mentioned below.
If the protection device is used as cover, regular openings complying with the explosion protection demands can
be made that must not exceed the following dimensions:
Cover [mm]
Openings Top side Lateral parts Distance „Sr“
Circular - max. diameter 4 8
10
Rectangular - max. lateral length 4 8
10
Straight or curved slot -
max. lateral length/height prohibited 8 20
!
CAUTION!
If you note any irregularities with the coupling during operation, the drive unit must be turned
off immediately. The cause of the breakdown must be found out with the table „Breakdowns“
and, if possible, be eliminated according to the proposals. The potential breakdowns
mentioned can be hints only. To find out the cause all operating factors and machine
components must be considered.
Coupling layer:
If coated (priming, painting etc.) couplings are used in hazardous areas, the requirements to
conductability and layer thickness must be considered. In case of paintings up to 200 µm no
electrostatic load can be expected. Multiple coatings exceeding a thickness of 200 µm are
prohibited for explosion group llC.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
18 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.7 Breakdowns, Causes and Elimination
The below-mentioned errors can lead to an incorrect use of the BoWex-ELASTIC®coupling. In addition to the
stipulations in these operating and mounting instructions please make sure to avoid these errors.
The errors listed can only be clues to search for the errors. When searching for the error the adjacent
components must be generally included.
Due to incorrect use the coupling may become a source of ignition.
EC Standard 94/9/EC requires a special care from the manufacturer and the user.
General errors of incorrect use
Important data for the coupling selection were not forwarded.
The calculation of the shaft/hub connection was not considered.
Coupling parts with damage occurred during transport are assembled.
If the heated hubs are assembled, the permissible temperature is exceeded.
The fits of the parts to be assembled are not coordinated with each other.
Tightening torques are fallen below/exceeded.
Components are replaced by mistake/put together incorrectly.
No original KTR parts (purchased parts) are used.
Old elastomer parts/already worn out elastomer parts or elastomer parts that were stored too long are used.
The coupling used/the coupling protection used is not suitable for the operation in hazardous areas and does
not correspond to EC Standard 94/9/EC, respectively.
Maintenance intervals are not observed.
breakdowns causes
hints to danger for
hazardous areas elimination
misalignment micro
friction at the
toothing of the
elastomer part
danger of ignition due
to hot surfaces
1) put the unit out of operation
2) eliminate the reason for the
misalignment (e. g. loose foundation
bolts, fracture of the engine fixing, heat
expansion of unit components, change
of the assembly dimension E of the
coupling)
3) checking of wear see under point 5.4
change of the
running noises
and / or occurring
vibrations
loose screws for
axial securement of
hubs
danger of ignition due
to hot surfaces
1) put the unit out of operation
2) check alignment of coupling
3) tighten the screws to secure the hubs
and secure against self-loosening
4) checking of wear see under point 5.4
break of the
elastomer part /
toothing
break of the elastomer
part / toothing
due to high shock
energy / overload
---
1) put the unit out of operation
2) disassemble the coupling and remove
remainders of the elastomer part
3) check coupling parts and replace damaged
coupling parts
4) insert elastomer part, assemble coupling
parts
5) find out the reason for overload

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
19 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.7 Breakdowns, Causes and Elimination
breakdowns causes
hints to danger for
hazardous areas elimination
operating
parameters do not
correspond to the
performance of the
coupling
---
1) put the unit out of operation
2) check the operating parameters and
select a larger coupling (consider
installation space)
3) assemble new coupling size
4) check alignment
break of the
elastomer part /
toothing
mistake in service of
the unit ---
1) put the unit out of operation
2) disassemble the coupling and remove
remainders of the elastomer part
3) check coupling parts and replace
damaged coupling parts
4) insert elastomer part, assemble
coupling parts
5) instruct and train the service staff
drive vibrations danger of ignition due
to hot surfaces
1) put the unit out of operation
2) disassemble the coupling and remove
remainders of the elastomer part
3) check coupling parts and replace
damaged coupling parts
4) insert elastomer part, assemble
coupling parts
5) check alignment, correct if necessary
6) find out the reason for the vibrations
ambient / contact
temperatures which
are too high for the
elastomer part, max.
permissible
e. g. T4 =
-30 °C / +100 °C
danger of ignition due
to hot surfaces
1) put the unit out of operation
2) disassemble the coupling and remove
remainders of the elastomer part
3) check coupling parts and replace
damaged coupling parts
4) insert elastomer part, assemble
coupling parts
5) check alignment, correct if necessary
6) check and regulate ambient / contact
temperature
excessive wear at
the elastomer part /
toothing
e. g. contact with
aggressive liquids /
oils, ozone-
influence, too high
ambient
temperatures etc.
effecting a physical
change of the
elastomer part
---
1) put the unit out of operation
2) disassemble the coupling and remove
remainders of the elastomer part
3) check coupling parts and replace
damaged coupling parts
4) insert elastomer part, assemble
coupling parts
5) check alignment, correct if necessary
6) make sure that further physical changes
of the elastomer part are excluded
If you operate with a worn elastomer part (see item 5.2) a proper operation meeting the explosion
protection requirements and acc. to Standard 94/9/EC is not ensured.
ATTENTION!
KTR does not assume any liabilities or warranties regarding the use of spare parts and
accessories which are not provided by KTR and for the damages resulting herefrom.

KTR Kupplungstechnik
GmbH
D-48407 Rheine
BoWex-ELASTIC®
Operating/Assembly Instructions
Type HEW and HEW-ZS
KTR-N
Sheet:
Edition:
40114 EN
20 of 20
5
Drawn: 08.11.11 Pz/Hk Replaced for: KTR-N valid from 08.04.04Please note protection
mark ISO 16016. Verified: 09.11.11 Pz Replaced by:
5 Enclosure A
Hints and Instructions Regarding the Use in Hazardous Areas
5.8 EC Certificate of Conformity
EC Certificate of Conformity
corresponding to EC Standard 94/9/EC dated 23 March 1994
and to the legal regulations
The manufacturer - KTR Kupplungstechnik GmbH, D-48432 Rheine - states that the
BoWex-ELASTIC- highly flexible flange couplings
described in these mounting instructions and designed for explosion protection correspond to Article 1
(3) b) of Standard 94/9/EC and comply with the general Safety and Health Requirements according to
enclosure II of Standard 94/9/EC.
The BoWex-ELASTIC®is in accordance with the specifications of the standard 94/9/EC. One or
several standards mentioned in the corresponding EC type test certificate IBExU01ATEXB004_05 X
were in part replaced by updated versions.
KTR Kupplungstechnik GmbH as the manufacturer confirms that the product mentioned above is in
accordance with the specifications of the new standards, too.
According to article 8 (1) of Standard 94/9/EC the technical documentation is deposited with the:
IBExU
Institut für Sicherheitstechnik GmbH
Fuchsmühlenweg 7
09599 Freiberg
Rheine, 08.11.11 i. V. i. V.
Date Reinhard Wibbeling
Engineering Manager
Josef Schürhörster
Product Manager